首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   454篇
  免费   6篇
电工技术   6篇
化学工业   45篇
机械仪表   2篇
建筑科学   20篇
矿业工程   1篇
能源动力   4篇
轻工业   36篇
水利工程   4篇
无线电   34篇
一般工业技术   41篇
冶金工业   205篇
原子能技术   1篇
自动化技术   61篇
  2023年   4篇
  2022年   4篇
  2021年   8篇
  2020年   4篇
  2019年   7篇
  2018年   4篇
  2017年   6篇
  2016年   6篇
  2015年   4篇
  2014年   9篇
  2013年   15篇
  2012年   11篇
  2011年   21篇
  2010年   23篇
  2009年   18篇
  2008年   12篇
  2007年   20篇
  2006年   15篇
  2005年   22篇
  2004年   17篇
  2003年   17篇
  2002年   19篇
  2001年   13篇
  2000年   9篇
  1999年   8篇
  1998年   10篇
  1997年   10篇
  1996年   12篇
  1995年   14篇
  1994年   7篇
  1993年   13篇
  1992年   9篇
  1990年   9篇
  1989年   9篇
  1988年   6篇
  1987年   8篇
  1986年   3篇
  1985年   11篇
  1983年   4篇
  1982年   4篇
  1980年   2篇
  1979年   2篇
  1978年   5篇
  1977年   3篇
  1975年   4篇
  1973年   3篇
  1972年   5篇
  1971年   2篇
  1969年   2篇
  1957年   1篇
排序方式: 共有460条查询结果,搜索用时 15 毫秒
41.
42.
Few researchers have studied whether weight gain has an impact on short-term relapse to smoking. The authors of this study investigated predictors of relapse among 989 participants (60% women) in a randomized, double-blind, 10-week multicenter trial to determine the effect of fluoxetine (30 or 60 mg) versus placebo in combination with behavioral counseling for smoking cessation. Medication compliance and smoking status were biochemically verified. At Visit 2, participants were asked to set a quit date within the subsequent 2 visits. A proportional hazards regression model was used to predict risk of relapse within the first 3 months of quitting. Weight gain predicted relapse, but for men only. Female gender also predicted relapse. The results led the authors to question whether postcessation weight gain interventions should be restricted to women smokers. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
43.
项目愈大,设计师发挥的空间就愈大,这似乎是个定律,故当San Interiors的邢穗红被委托,为面积达150000平方尺的Michel House作室内设计时,她发觉那42间寝室、多个办公室、康乐设施等地方,让她不止能表达一种风格的设计,而且可在一个屋檐下创造多种风格.  相似文献   
44.
Studied the influence of positive and negative affect induced by cognitive mediation on behaviors thought to reflect depression. Data from 88 undergraduates who completed the Multiple Affect Adjective Checklist and who were subsequently assigned to 3 mood-induction conditions (elation, depression, and neutral) support a cognitive mediation theory of depression and suggest that affect can be manipulated in the laboratory. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
45.
46.
The short-term psychological responses of 60 adult women tested for a BRCA1 gene mutation associated with a high risk of breast and ovarian cancer were investigated. Participants were members of a large kindred enrolled in an ongoing prospective study of the psychosocial impact of genetic testing. Initial results from participants who completed both the pretest baseline and the 1-2 week posttest follow-up interviews are reported. Gene mutation carriers manifested significantly higher levels of test-related psychological distress, as measured by the Impact of Event Scale, when compared with noncarriers. The highest levels of test-related distress were observed among mutation carriers with no history of cancer or cancer-related surgery. Although general distress (state anxiety) declined after testing, carriers were more distressed than noncarriers at follow-up. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
47.
Experts predict that as we approach the year 2000, employee brainpower and other knowledge resources are rapidly becoming the most important factors driving business profitability. The challenge for organizations over the next decade will be to understand the role of knowledge resources in creating value for firms. This article provides three perspectives to understand the notion of knowledge management. The first section provides an overview of trends and issues that highlight the emergence of the knowledge era. The second section of the article recaps the results of a survey of Fortune 500 and Post 300 firms that the authors conducted to learn about knowledge management practices. The last section of the article provides guidelines for getting started in knowledge management.  相似文献   
48.
Examined transformational or recontextualizing operations underlying the problem solving of young writers. A stimulated-recall procedure, which enabled protocol analyses to be performed on participants' in situ comments, was employed with 53 12-yr-olds to examine their reports of their own writing processes. A narrative-writing task was used as a context for these children in which to comment on their writing as they wrote. The protocols of the sessions were recorded, transcribed, and evaluated for evidence of transformative problem-solving behaviors (largely as identified by C. Bereiter and M. Scardamalia, 1987), including: extended start-up time, time-monitoring, task completion time, note-making, oral reports of planning, audience awareness, and revision of story plans, and the use of a range of sources for story ideas. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
49.
The use of the hierarchical linear modeling (HLM; A. S. Bryk & S. W. Raudenbush, 1992) statistical procedure has recently become more common. The author reviews HLM, discusses its advantages over ordinary least squares regression in modeling cross-level data, and demonstrates advantages to group researchers: more precise estimates of the relative strength of the relationships between variables at 2 or more levels of analysis; increased power due to distinguishing between random error and "error" attributed to between-group variance; clarity about if and why some group properties might affect the strength of bivariate individual-level relationships; random sampling only at the highest level of analysis, because levels nested within are assumed to be intercorrelated; and the choice of comparing individuals to the whole population or just those within the same groups. (PsycINFO Database Record (c) 2010 APA, all rights reserved)  相似文献   
50.
We describe a microprocessor-based device for analyzing ST-segment changes of the electrocardiogram in the operating room during general anesthesia. The device identifies significant components of the ECG waveform, detects arrhythmias, and performs ST-segment measurements. Measured values of heart rate, QRS duration, R-wave magnitude, and ST-segment level, slope, area, and index are selectively displayed on a front-panel numeric display and can be recorded in analog form with an FM tape recorder. Provided are details of the battery-operated hardware, the ST-analysis software, and the results of 60 h of clinical trials. Possible uses are proposed for trend analysis during anesthesia.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号